I have a NAD 315bee integrated and a marantz pm8004.
The Marantz, at first, does not feel as powerful and exciting (dynamic range, bass impact..) as the NAD. However, after further listening, the marantz is definetely in a different class: better imaging, wonderful "liquid" midrange, nicely controlled bass, less incisive on top.
The NAD gives a good first impression with a sound that feels powerful. But it gets loud, not powerful, ver quickly. It is a terrific integrated for the money, but the marantz is definitely a step above, with both my Rega rs5 and psb image t5.
For action movies, I like the Nad + psb just for the explosions... but for the rest (talk shows, music, etc...), the marantz + rega combo is far far better.